Type carrier for telegraph type printing apparatus



June 10, 1958 R, GRlFFlTH 2,838,156

TYPE CARRIER FCR TELEGRAPH TYPE PRINTING APPARATUS Filed May 2, 1955 Inventor Pan/mo G. G k/ FF! TH A ttorn e y United Saates Patent TYPECARRIER FOR TELEGRAPH TYPE PRINTING APPARATUS Ronald George Griflith,Mount Royal, Montreal, Quebec, Canada Application May 2, 1955, SerialNo. 505,480

Claims priority, application Great Britain May 3, 1954 2 Claims. (Cl.197-53) This invention relates to telegraph printing apparatus whereinaggregate motion mechanism is provided for moving a type carrier so asto select type faces for printing, such as is described in Britishpatent specification 441,090.

With such telegraph printing mechanism wherein the a type carrier istraversed to produce letter spaced printing,

considerable difiiculty is met in providing a light type carriermechanism in such a manner that a printing hammer mechanism has accessto the end of the shank of the type positioned for printing. Diflicultyis also encountered with such type carrier mechanism in avoidingobstruction by it of the reading of previously printed characters. Theobject of this invention is to provide a type carrier, for use with suchtelegraph printing apparatus, of light and simplified construction,which is arranged so as to be readily demounted, and wherein typemembers are easily changed.

According to the present invention, a number of parallel rows of typemembers are supported in the type carrier so that the type faces lie ona part-cylindrical surface with the rows spaced axially and extendingcircumferentially, and each type member is slidable radially in itssupport so as to be operated by a printing hammer and is brought intothe printing position by a combination of axial and angular movement ofthe type carrier. Preferably the part-cylindrical surface extends in anarc of less than 180 degrees so as to provide ready access for theprinting hammer. Each type member may be springurged towards the axis ofthe cylinder so that it automatically returns to its original positionwhen operated by the printing hammer.

In a simple form of construction, the type members are mounted between apair of curved plates which are slotted to permit the sliding movementsof the shanks of the members and the rear plate may be made removable toleave all the type members retained in the front plate under the controlof their springs, and thus allow changing of type members.

A type carrier in accordance with the invention and suitable for use inapparatus as shown in the aforesaid application will now be described inmore detail by way of example with reference to the accompanyingdrawings, in which:

Figure '1 is a perspective view; and

Figure 2 is a detailed view showing the construction of a type member.

The main body of the type carrier is constituted by a pair ofpart-cylindrical curved plates 1' and 2 which extend over an arc of lessthan 180 to allow free operation of the printing hammer. The plates aresecured at their ends to blocks 3 and 4, the outer plate 1 being held byscrews 5 and the inner plate 2 being held by screws 6. The blocks 3 and4 are mounted on posts 7 and 8 which in use are inserted incorresponding sockets in the mounting 82 shown in U. S. application,Serial No.

504,853 filed April 29, 1955. The post 8 is formed with a groove 9 whichco-operates with a lock in the mounting and the type carrier as a wholeis thus designed to be readily demountable since it can be readilyattached to and removed from its mounting by means of a simple slidingmotion.

The type carrier supports four rows of type members having shanks 12 andfaces 13. The shanks 12 slide in slots in the plates 1 and 2 and each isurged towards the axis of the cylindrical surface, that is to say, theright as seen in Figure 2 by means of a spring 14, one end of whichabuts against the plate 1 and the other end of which is located in anopening 15. By removing the screws 6 the complete plate 2 may be removedand all the type members are retained in position since each type face13 is pressed against the plate 1 by means of its spring 14. Thisgreatly simplifies maintenance of the type carrier.

The type members are arranged in four vertically spaced rows eachcontaining sixteen members and are arranged to be actuated by a printinghammer 230 shown in the aforesaid application. In order to bring anyselected type member into the printing position, the type carrier isgiven an angular and a vertical motion, being registered in position asdescribed in the aforesaid application.

I claim:

l. A type carrier for a telegraph type printing apparatus comprisingparallel front and rear arcuate bearing members, and readily removablemeans for securing said members in parallel relation, to mount saidarcuate bearing members to have a common axis, each of said bearingmembers having a part-cylindrical surface extending in an arc of lessthan degrees about said common axis, a plurality of type members, eachof said type members extending between said front and rear bearingmembers, means including said front and rear bearing members forsupporting said type members so that each has slidable movement betweensaid front and rear bearing members, said type members being arranged inparallel rows which are spaced axially and extend circumferentially withrespect to said axis, said type members bearing type faces which lie ina part cylindrical convex surface parallel to and in front of the saidfront bearing member, whereby any one of said type members may bebrought selectively into a predetermined printing position by movingsaid carrier axially along and angularly about its axis, and a pluralityof springs mounted in operative relation to said type members when saidarcuate bearing members are secured together in parallel relation sothat each of said springs urges one of said type members towards saidcommon axis and so that upon removal of said securing means to releasethe rear bearing member from the front bearing member, all of said typemembers are retained by the said front bearing member under the controlof said springs.

2. A type carrier according to claim 1 for use in a telegraph printingapparatus including a printing hammer, said carrier also comprisingmeans for detachably mounting it upon said printing apparatus, saidmounting means being located on said carrier at points spaced away fromthe said common axis, whereby movement of the printing hammer throughsaid axis is permitted.

References Cited in the file of this patent UNITED STATES PATENTS436,319 Silkman Sept-9, 1890 579,047 Dudley Mar. 16, 1897 942,825Hauerstein Dec. 7, 1909

